I picked up one of these, this seems to be the only functional issue. Sounds fantastic over analog out and headphones but no red light from the optical out. I'm hoping it's a fairly simple issue, maybe optical board, since everything else works. Any advice on what to check would be appreciated. Also, I'm wondering the best way to lubricate the drive. What would be the best kind of oil/grease and where would I apply it? Checked the service manual and didn't find anything. Drawer works fine but seems like maybe it should be quieter as it slides in and out. Thanks a lot for any input!